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La división del trabajo entre los monómeros dentro del tetramero Mu transposasa
T A Baker1, M Mizuuchi, H Savilahti
1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases National Institutes of Health, Bethesda, Maryland 20892.
Cell
|August 27, 1993
Resumen
El extremo C de la Mu transposasa (MuA) es esencial para la recombinación del ADN. Una región específica de 30 aminoácidos es crítica para la escisión del ADN y la transferencia de hebras, con los cuatro monómeros necesarios para la transferencia de hebras.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La Mu transposasa (MuA) media la transposición del ADN a través de una serie de pasos que incluyen la escisión del ADN y la transferencia de hebras.
- La comprensión de los dominios funcionales de MuA es crucial para elucidar el mecanismo de transposición.
Objetivo del estudio:
- Identificar las regiones críticas de la Mu transposasa (MuA) responsables de la escisión del ADN y la transferencia de hebras.
- Investigar el papel del extremo C en la actividad catalítica del MuA.
Principales métodos:
- Análisis de los derivados de la deleción del extremo C del MuA.
- Evaluación de la actividad de las proteínas MuA salvajes y mutantes in vitro.
- Formación y análisis de tetrámeros mixtos compuestos de tipo silvestre y MuA. mutante de deleción.
Principales resultados:
- Una región de 30 aminoácidos (residuos 575-605) en el extremo C de MuA es crítica para la escisión del ADN y la transferencia de hebras.
- Los mutantes de eliminación que carecen de esta región están inactivos de forma independiente, pero pueden ensamblarse en tetrámeros mixtos con MuA. de tipo salvaje.
- Los tetrámeros mixtos realizan la escisión del ADN del donante, pero no promueven la transferencia de hebras.
Conclusiones:
- El centro activo para la actividad de la Mu transposasa está compuesto por los terminales C de los cuatro monómeros MuA.
- Dos monómeros son suficientes para la escisión del ADN del donante, mientras que los cuatro son necesarios para la transferencia de hebras.
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